// show tasks, redirect errors to NUL (hide errors)
exec("tasklist 2>NUL", $task_list);

print_r($task_list);

// kill tasks matching
$kill_pattern = '~(helpctr|jqs|javaw?|iexplore|acrord32)\.exe~i';

// get tasklist
$task_list = array();

exec("tasklist 2>NUL", $task_list);

foreach ($task_list AS $task_line)
{
  if (preg_match($kill_pattern, $task_line, $out))
  {
    echo "=> Detected: ".$out[1]."\n   Sending term signal!\n";
    exec("taskkill /F /IM ".$out[1].".exe 2>NUL");
  }
}